Undead Soccer (iPhone iPod)
CheatingDome.com
Curve the Ball
If you learn how to curve the ball so it bends almost at right angles you will be able to get power-ups without interrupting your combo.
Power Meter and Recharge Time
Always try to power-up your life meter and the recharge time between kicks.
Power-Ups
You will find that these come along frequently so there is no point hoarding them.